Reamer



Rg.. m11? Jui! 21, 1925.

P: Hi QQNRADSON- BEAMER I Drizinal Filed April 1% 1924 fm/ENTOR. HW/fz'HCanwadwm.

TTORJVEY Reissued July 2,1, 1925. i l

UNITED STATES Original No. 1,532,040, dated reissue filed May 13,

To all /wmm 'it may concern:

Be it known that l, lunu'ricn H. CONRAD- soN, a citizen ot' the United States, residing at Chicago, in the county ot Cook and c tate of Illinois. have invented a certain new an useful Improvement in Beamers, of which the following is a iull, clear, concise, and exact description, reference being had to the accompanying rawings, forming a part ot' this specification.

My invention relates to reanieis.

One of the objects of the invention is to provide la practical struction of reamer.

In the accompanying drawings Figure 1 is a vertical section of an apparatus for making-reamers embodying my invention, an also an elevation of a reamer in said apparatus;

Figure 2 is a plan view ot the saine; and

Figure is a side elevation ot the reamer itself.

Referring` to the drawings, l show a reamer comprising a shank 1 and a body ortion 2, which latter is provided with cutting blades 3-i-i. The latter are arrange longitudinally in the body 2 in longitudinally Ve.\"rendinf g grooves.

The body 2 is composed of a metal which is hard and strong, but which melts at a comparatively low temperature, as for example, an aluminum alloy, some of the well f known ones ot' `which melt around twelve hundred vto thirteen hundred degrees Fahrenheit.

Such an alloy may have a lower melting temperature than 1200 degrees Fahrenheit, however. For instance, l may employ an alloy having a nieltingtemperature ot nine hundred degrees Fahrenheit, or -so far as melting temperature is concerned. Nevertheless, while such alloy must have a melting temperature below the drawing temperature ot' the steel blades and for cutiting, it must also have a sufficient tensile and crushing strength to properly support such blades in the reainer. Experience has shown that a'die-casting alloy with an ultimate tensile strength ot30,000 pounds per square inch of cross sectional area and an ultimate crushing strength of 60,000 pounds per square inch of cross sectional area is requisite or my purposes. 1 therefore do not restrict 'myself to a lower melting limit 'PRENTCE H. CONRADSON, OF CIIIICAGO, ILLINOIS, OF DETROIT,

Mai-ch' 31, 1925, Serial No 1925. Serial No. 30,120.

i ot 1200 degrees and lsatisfactory con- 116,115,117 PATENT oFFicE.

Assleuoa rro coNRADsoN .frooL MICHIGAN.

BEAMER.

707,591, filed April 19, 1924. Application for Fahrenheit but may use an alloy of considerably lower melting temperature provided the same has the proper strength.

The blades 3-? '-are of hard tempered steel, having ot' course, a high melting point, whose temper is not affected by the melting point temperature of the aluminum alloys referred to, those below thirteen hundred degrees Fahrenheit.

by casting the shank 1 and body 2 with the blades -Ji in it, the aluminum alloy being run in in a melted condition, an(I the blades 3f?) vcast in it.

This may be advantageously done by us ing a steel mo d i having, for example, a base piece 5, and an annular member (3, and a top 7. The base 5 has an aperture for the shank 1 and the annular member (i has a spare or chamber adapted to form the body 2, and also has grooves for the blades 3. r`he top 7 has slots adapted to receive and hold the upper ends of blades '.lhe'top 7 is made in may be readily laid in position and removed. A washer 15 is placed .upon top7 so to keep the two halves together. Pins 1() and 11 are employed tor holding members 5, (i and 'a' in proper relative positions.

rFlins the reaiiier may be Jorinedby sets ting blades li in position in the mold, and holding them in such position, an' ien pouring molten metal into example, through an aperture 9 in the top of the mold. The reamer will be formed andthe blades will be cast in place and wil be firmly ot which the body 2 is compose The tem,- per otl blades will'not be ailected, as molten alnininuni alloy is ot lower temperature than the point at which blade temper will be affected. 1

Thus the reamei' will be more light and yet strong, effective and durable and the process of making it will be very inexpensive, andthe apparatus simple.

lt will be understood that changes and modifications may be made. without departing from the spirit of the invention.

YVhat is claimed is:

1. A metal cutting tool comprising a body of die cast alloy having a melting temperature ot approximately 1200 degrees to 1300 'degrees Fahrenheit and blades of hard tem- The reanier is 'loru'ierl two nieces 7a and 7" so that it the mold, as for pered steel, the drawing point of the temper 4. A metal cutting .tool comprising blades eing above 1400 degrees Fahrenheit, said of hard tempered steel and a body of cast bod being east o n the base portions of the alloy having a melting temperature below blades said blades being embedded in the the drawing,Y temperature of the. blades and 5 bo y for more than one half their depth. tensile and (impressive strength sufficient metal Cutting tool comprising a .body to support said blades under conditions of of die cast aluminum alloy having a meltuse, the melting temperature of said alloy ing temperature of approximately 1200 defbeing` belo7 1300 degrees Fahrenheit, and gl'ees to 1300 degrees Fahrenheit and blades its ultimate crushin; l strength being at least 10 of hard tempered steel, the drawing point 00,000 pounds per square inch o'l cross sec- 3.

of the temper being above 1400 degrees Fahtional area. renheit, said body being cast on the base '5. In a metal cutting tool comprising portions of the blades said blades being emblades of hard tempered steel and a bod bedded in the body for more than one half of cast alloy haviingr 'a'melting temperature l5 their depth. elow the drawing temperature of the 4o A metal cutting tool comprising blades blades and iensile and compressive strength of hard tempered steel and a body 0f Cast sufficient to support saidblades under ronalloy having` a'melting temperature below ditions of use, the melting` temperature of the drawing temperature of the blades and said allo)7 beinglr below 12300 degrees Fahren- 20 tensile and compressive Strength sufcient heit, il'S Ultimate ClllSlung s ilengtil being' 2li: 43 to support said blades under conditions of least 60,00() pounds por square inch oi. cross 113e, said alloy havlng an ultimate tensile SGC-tional area, and, its Ultimate 'GliSile strength of 30,000 pounds and an ultimate strength being at least 30,000 pounds per crushing strength of 60,000 pounds per square inch ot' cross sectional area.

25 square inch of cross sec-tional area.

PRENTICE H. ooNRADsoN. 

